Toshiba RAS-10SK-E, RAS-10SKX Role of Indoor Unit Controller, Block display, Symptom, Check

9-2. Primary Judgement of Trouble Sources

9-2-1. Role of Indoor Unit Controller

The indoor unit controller receives the operation com- mands from the remote control and assumes the fol- lowing functions.

•Measurement of the draft air temperature of the indoor heat exchanger by using the thermo sen- sor (TA).

•Louver motor control

•Control of the indoor fan motor operation

•Control of the LED display

•Control of the outdoor unit compressor and the out- door fan motor.

9-2-2. Display of Abnormalities and Judgement of the Abnormal Spots

The indoor unit of this machine observes the opera- tion condition of the air conditioner and displays the contents of the self-diagnosis as block displays on the display panel of the indoor unit.

	Table 9-2-1
	Block display	Block display
A	OPERATION display flashing (1 Hz)	Power failure (when power is ON)
B	OPERATION display flashing (5 Hz)	Thermo sensor (TA) short/break
C	OPERATION display flashing (5 Hz)	Heat exchanger sensor (TC) short/break
D	OPERATION display flashing (5 Hz)	Indoor fan lock, abnormality of indoor fan
E	OPERATION display flashing (5 Hz)	Indoor PC board failure
F	OPERATION, TIMER and FAN-ONLY display	• Gas shortage, other refrigerant cycle trouble
	flashing (5 Hz)	• Heat exchanger sensor open/break/short
		• Overload relay trouble

(1)Judgement from defective operation or abnormal operation

Table 9-2-2

Symptom	Check		Primary judgement
No reaction on	Turn off the power once, turn it on	Remote control is	The indoor part (including the
remote control	again and try to operate the remote	not possible.	remote control) is defective.
operation	control again.
		Remote control is	OK.
		possible.
The outdoor fan	The compressor operates.		The outdoor part is defective.
does not rotate			(outdoor fan motor)
	The compressor does not operate.		The inside part is defective.

– 34 –